﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
using System.Xml.Xsl;
using System.Data;

namespace SPListsCaller.Tools
{
    public class ZRowTools
    {
        public static readonly string xsltFromZRowToXml =
                "<xsl:stylesheet version=\"1.0\" " +
                 "xmlns:xsl=\"http://www.w3.org/1999/XSL/Transform\" " +
                 "xmlns:s=\"uuid:BDC6E3F0-6DA3-11d1-A2A3-00AA00C14882\" " +
                 "xmlns:z=\"#RowsetSchema\">" +
             "<s:Schema id=\"RowsetSchema\"/>" +
             "<xsl:output method=\"xml\" omit-xml-declaration=\"yes\" />" +
             "<xsl:template match=\"/\">" +
              "<xsl:text disable-output-escaping=\"yes\">&lt;rows&gt;</xsl:text>" +
              "<xsl:apply-templates select=\"//z:row\"/>" +
              "<xsl:text disable-output-escaping=\"yes\">&lt;/rows&gt;</xsl:text>" +
             "</xsl:template>" +
             "<xsl:template match=\"z:row\">" +
              "<xsl:text disable-output-escaping=\"yes\">&lt;row&gt;</xsl:text>" +
              "<xsl:apply-templates select=\"@*\"/>" +
              "<xsl:text disable-output-escaping=\"yes\">&lt;/row&gt;</xsl:text>" +
             "</xsl:template>" +
             "<xsl:template match=\"@*\">" +
              "<xsl:text disable-output-escaping=\"yes\">&lt;</xsl:text>" +
              //"<xsl:value-of select=\"substring-after(name(), 'ows_')\"/>" +
              "<xsl:value-of select=\"name()\"/>" +
              "<xsl:text disable-output-escaping=\"yes\">&gt;</xsl:text>" +
              "<xsl:value-of select=\".\"/>" +
              "<xsl:text disable-output-escaping=\"yes\">&lt;/</xsl:text>" +
              //"<xsl:value-of select=\"substring-after(name(), 'ows_')\"/>" +
              "<xsl:value-of select=\"name()\"/>" +
              "<xsl:text disable-output-escaping=\"yes\">&gt;</xsl:text>" +
             "</xsl:template>" +
            "</xsl:stylesheet>";

        public static DataTable GetFullDataTable(string xml)
        {
            DataSet ds = new DataSet();

            string xmlData = ConvertZRowToRegularXml(xml);
            if (string.IsNullOrEmpty(xmlData))
                return null;

            using (System.IO.StringReader sr = new System.IO.StringReader(xmlData))
            {
                ds.ReadXml(sr, XmlReadMode.Auto);

                if (ds.Tables.Count == 0)
                    return null;

                return ds.Tables[0];
            }
        }

        static string ConvertZRowToRegularXml(string zRowData)
        {
            XslCompiledTransform transform = new XslCompiledTransform();
            XmlDocument tidyXsl = new XmlDocument();

            try
            {
                //Transformer
                tidyXsl.LoadXml(xsltFromZRowToXml);
                transform.Load(tidyXsl);

                //output (result) writers
                using (System.IO.StringWriter sw = new System.IO.StringWriter())
                {
                    using (XmlTextWriter tw = new XmlTextWriter(sw))
                    {
                        //Source (input) readers
                        using (System.IO.StringReader srZRow = new System.IO.StringReader(zRowData))
                        {
                            using (XmlTextReader xtrZRow = new XmlTextReader(srZRow))
                            {
                                //Transform
                                transform.Transform(xtrZRow, null, tw);
                                return sw.ToString();
                            }
                        }
                    }
                }
            }
            catch
            {
                return null;
            }
        }
    }
}
